We characterized primary care physicians’ perspectives for overusing tests and treatments that are not indicated in older adults, targeting physicians who were frequent high users of: PSA screening in men aged ≥ 76 years, urine testing in women aged ≥ 65 years without specific genitourinary or infectious signs or symptoms, and prescribing insulin or oral hypoglycemic medication in adults aged ≥ 75 years with diabetes and HbA1C < 7.0%. Here, INS is linked to diabetes mellitus.